The Prophet (peace be upon him) used to command us to free slaves on the occasion of an eclipse (Using translation from Abū Dāʾūd 1192)

كَانَ النَّبِيُّ ﷺ «يَأْمُرُ بِالْعَتَاقَةِ فِي صَلَاةِ الْكُسُوفِ»